JA0044 Quantification of multi-residue levels in peach juices, pulps and peels using dispersive liquid–liquid microextraction based on floating organic droplet coupled with gas chromatography-electron capture detection
来源:Journal of Chromatography B
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作者:Guzalnur Matsadiq
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发布时间: 2062天前
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2665 次浏览
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In this paper, polychlorinated biphenyl (PCB), organochlorine pesticide (OCP) and pyrethroid pesticides in peach was investigated by comparing their residual level in peach juice, pulps and peels using dispersive liquid–liquid microextraction based on solidification of floating organic droplet (DLLME-SFO) combined with gas chromatography-electron capture detection (GC-ECD). Extraction conditions such as the type of extractant, volume of extractant and dispersant, salt effect and extraction time were optimized. For juice samples, the linearity of the method was obtained in the range of 10–2000 ng L-1,with determination coefficients > 0.99. The limits of detection (LOD) of the method were ranged between 2.8 and 18.5 ng L-1. For pulp and peel samples, the developed method is linear over the range assayed, 1–20 g kg-1,with coefficients also >0.99. The relative recoveries of compounds analyzed from juice, pulp and peel samples were in the range of 73–106% with a relative standard deviation between 2.6 and 11.8%. The proposed method was applied to the simultaneous analysis of residues in real peach juice, pulp and peel samples. As a result, there were no target analytes found in peach juices and pulps while 3.3 g kg-1 cyhalothrin and 3.5 g kg-1 fenvalerate were found in peels. The experiment results revealed that the pyrethroid residues just deposited on the peels of the fruits, but did not move into pulps and juices.
1 Introduction
In recent years, potential health risks from pesticides and other organic
pollutant residues in food stuffs have become a main public concern. Pesticides
such as OCP and pyrethroid pesticides have been used extensively to spray on
the surface of fruits to control pest. So in our daily life, we are always
persuaded to wash the fruits before consumption [1].
However, the pesticide residues tend to deposit on the fruit peels and transfer
from peels into pulps and juices in long term process and cause some risk to
human health [2,3]. Meanwhile, PCBs were widespread organic
pollutants in air, soil and water. They are highly resistant and bioaccumula tive
in food chain [4], so a trace level PCBs may still exist in
fruits. Therefore, determination of multi-residues in fruits as well as the comparative
analysis of multi-residue mobility in different parts of fruits was an urgent
need for health protection [5]. Since the
investigation of multi-residue mobility required that the fruit juices, pulps
and peels should be separated and compounds of different polarities,
solubilities, volatilities in different parts of fruits should be
simultaneously extracted and analyzed, we should develop an efficient sample
pretreatment method for trace level detection [6]......
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